setCustomParameters

Sets the OAuth custom parameters to pass in a Google OAuth request for popup
and redirect sign-in operations.
Valid parameters include 'hd', 'hl', 'include_granted_scopes', 'login_hint'
and 'prompt'.
For a detailed list, check the
Google
documentation.
Reserved required OAuth 2.0 parameters such as 'client_id', 'redirect_uri',
'scope', 'response_type' and 'state' are not allowed and will be ignored.